#include<iostream>
using namespace std;
#include<vector>
#include<algorithm>
#include<math.h>

int main(){
    vector<int> arr(3);
    for(int i = 0;i<3;i++){
        cin>>arr[i];
    }
    sort(arr.begin(),arr.end());

    //最大值arr[2]

    if(arr[0] + arr[1] > arr[2]){
        if(pow(arr[0],2) + pow(arr[1],2) == pow(arr[2],2)){
            cout<<"Right triangle"<<endl;
        }
        if(pow(arr[0],2) + pow(arr[1],2) > pow(arr[2],2)){
            cout<<"Acute triangle"<<endl;
        }
        if(pow(arr[0],2) + pow(arr[1],2) < pow(arr[2],2)){
            cout<<"Obtuse triangle"<<endl;
        }
        if(arr[0] == arr[1] || arr[0] == arr[2] || arr[1] == arr[2]){
            cout<<"Isosceles triangle"<<endl;
        }
        if(arr[0] == arr[1] && arr[1] == arr[2]){
            cout<<"Equilateral triangle"<<endl;
        }
    }else{
        cout<<"Not triangle"<<endl;
    }

    return 0;
}